If your having troubles connecting to the internet in Firefox, your proxy settings maybe incorrect.
To check your settings, follow this guide.
- In Firefox, click on Tools –> Options.
- In the Advance section, click on the Network Tab
- Under Connection, click on settings
Most people’s connection settings should be set to Auto-Detect, but you can change them to fool other websites to think that you are located in another country.
For more information, you should read the follow posts I have written on MakeUseOf.com: